Ultrafast measurements of vibrational relaxation in the conjugated polymer poly(9,9-dioctylfluorene)

Wells, Jon-Paul R.; Lidzey, David G.; Phillips, P. Jonathan; Carder, Damian A.; Fox, A. Mark
October 2004
Applied Physics Letters;10/11/2004, Vol. 85 Issue 15, p3080
Academic Journal
We report the resonant pump–probe measurements used to study the dynamics of molecular vibrations in the conjugated polymer poly(9,9-dioctlyfluorene) (PFO). Free-electron-laser excited, pump–probe measurements on a drop-cast polymer film yield the lifetime of a series of different infrared active, high frequency vibrational modes at 5 K. A general trend of decreasing lifetime with increasing frequency of the vibrational mode seems consistent with an enhanced density of accepting states for high frequency modes. Our measurements provide an insight into the dissipation of energy in conjugated polymers, and have implications for exciton generation and dissociation mechanisms in organic optoelectronic devices.


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